function num_add(x, y) {
	console.log(arguments.length)
	console.log(arguments)
	console.log(Array.from(arguments))
	return x + y;
}
// console.log(num_add(1));
// console.log(num_add(1, 2));
// console.log(num_add(1, 2, 3));
num_add(1, 2, 3, 4, 5, 6)